Process of recovering ammonia by means of sodium bisulfate



G. Nt WS.

PROCESS OF HECVERING ANMONA'A BY MEANS OF SODIMM BISULFATE.

APPLICATION m50 OCT. 25, 1918.

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i0 imprmments Jiba invention dw application Serial U. En, NH3,

that :lifter the, splitmfg News@ NH3 myd-120 :ms scdium sulfate and ammohe mother lql'eors are ren m1-king cycle either after im? replacing; hhe Water if@ th@ crufe bsua'te.

5 *ha Wurking l'uetmffl ai'. ,fsmfim-d and im appauatus@ fw' oui. the promis which. QUQWS "L H-mi by the action of soum bsufac i@ be ie and connuous Huub mi up nmuy qu* ms ssamn. sluifate and usd for 1 3 l nel Z kgs. :1f ammonium into the rec/naive? A. named to boiling pom; by im wm'm :md all M1@ amn www? dissves While ad 1 snifuz@ is dehydramd Thu wmzlon i5; *van hy with wth@ l 4 on "ma drawing. 5# n wrzltm@ o? 110" 1s ntf-zuned,

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descxibd in that specifi- MME Cummins pres 79.0 L' in the 2G() kg. of Saks all and lf2() ligs. ot' sodium suit is reconstituted; these letter being present for the n'iost pirt in. the form of nouiile This addition of 10G of sodium sulu fete is only indicated. by Way oil illust-intimi for the purpose of rec(instituting the originel sludge; the addition of sodium. stili-atte may be omitted without any change on the process, the sludge obtained losing again treated as if the originel sludge were in question.

As will he seen each charge renders about l,000 lags. of pimductss e. 465 kgs. of :in--

hydrous sodium sulfate and 4:80 kgs. of eminoniuln sulfate Sludges containing' sodium sulfate or ammonium sulfate filter partic'ulerly well and the work takes piu ,e rapidly und simply. When the wishing waters are exhausted they are mixed together end the double salt, 'which is again delivered into the working cycle, is olotained by crystallization.

By varying the quantities of sodium sulfate or of ammonium snlate or of water in the original sludge the process inny he adapted to sodium hisuliztte of any compositionA` note seing aken that 100 parte of witterY saturated with nn'mioniuni sulfate :it about i100 C. dissolve 42.2 parte of sodium sulfate, and. that the separation of the double seit in such et mixture then practically only commences at about 600 C., eind lastly that the solubility of sult'nte of sn'nnoniu in 100 parts of Water decreases nearly regularly from 102 t0 75 parts ut teniperntures from 110o to 50D C., the water being sattulatel with sulfate of sodium.

This description is only given by wny of exannjgle so fur it relates to the quantities of material placed in the working cycle.

Claims;

l. The process of recovering uninionia oy ineens of sodium acid sulfate consisting in. subjecting sodium acid sulfate to the action of ammonia to forni crystalline sodium ammonium sulfate, heating the resulting' product `with :L solution of unnnoniuxn sul fate und separating the liquid portion from the residual sodium sulfate und reducing the temperature of Suid liquid portion to crystnllize out ammonium sulfate.

2. The process as defined in cluini l wherein the liquid separated from the said unnnoninni sulfate is concentrated und unothcr portion of sodium `ammonium sulfate und oit' sodium sulfate :nrc added thereto to substantially restore the original composition :ind then repeat the cycle of steps in testimony 'whey-cotl I have signed this speciiicntion.

GERHARD NCOLAAS VIS.

Vt/itnesses:

JOHN l?. SiMoNs, GrAs'roN un Mes'rimi.. 

